frost-protected shallow foundation


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frost-protected shallow foundation

A construction method that uses insulation and drainage to artificially raise the frost line of soil to a level that allows relatively short—shallow—foundations.In cold climates,building foundations must extend below the frost line to a depth of soil that does not freeze. Freezing causes soil to heave upward and then sink back again, shifting everything on top of the soil. It does not result in a very stable building base unless one takes steps to prevent soil movement.

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One that has prevailed is the frost-protected shallow foundation, or FPSF, for slab-on-grade homes.
Examples of these techniques (all of which are code approved) include advanced framing, raised-heel trusses, airtight drywall approach, frost-protected shallow foundations, and optimizing window design.
FROST-PROTECTED SHALLOW FOUNDATIONS, or FPSFs, provide protection against frost damage without the need for excavating below the frost line.
Many systems previously relegated to the "fringe" have gone mainstream and found a place of honor in the new International Residential Code (IRC), including structural insulated panels and frost-protected shallow foundations.